How to run exe from the (Session 0 Isolation) service

I am currently using VisualStudio 2015 to create a Windows service, and I would like to monitor a directory and have an exe file run if a PDF file is generated under it.

However, at this stage, when I start the service, nothing happens on the screen and
Task Manager confirmed that it was running in the background.

The cause was found to be "Session 0 Isolation" and
while referring to the site below. It is currently being improved, but it says, "Set the session of the logon user to a duplicate token." What exactly should I do?

I have just started C#, and I would appreciate it if you could let me know if you have time.
Thank you for your cooperation.

reference site:
Launch the GUI process from Windows Services